Ghostlink v1.15.1

[1.15.1] - 2026-07-28 (Release workflow fix)

• release-artifacts.yml's "Build release bundle" step was missing an
  explicit shell: bash. On ubuntu-latest/macos-latest that default
  shell already is bash, so it went unnoticed there — but windows-latest
  defaults to PowerShell, which fails immediately on the step's bash [[ ]] syntax. v1.15.0's release shipped with Linux and macOS binaries only;
  this release adds the missing Windows binary under a clean version tag
  rather than rewriting v1.15.0's already-published release.

---